use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
use serde::Serialize;
use std::io::{Read, Seek, Write};
use crate::mp4box::*;
#[derive(Debug, Clone, PartialEq, Eq, Default, Serialize)]
pub struct HdlrBox {
pub version: u8,
pub flags: u32,
pub handler_type: FourCC,
pub name: String,
}
impl HdlrBox {
pub fn get_type(&self) -> BoxType {
BoxType::HdlrBox
}
pub fn get_size(&self) -> u64 {
HEADER_SIZE + HEADER_EXT_SIZE + 20 + self.name.len() as u64 + 1
}
}
impl Mp4Box for HdlrBox {
fn box_type(&self) -> BoxType {
self.get_type()
}
fn box_size(&self) -> u64 {
self.get_size()
}
fn to_json(&self) -> Result<String> {
Ok(serde_json::to_string(&self).unwrap())
}
fn summary(&self) -> Result<String> {
let s = format!("handler_type={} name={}", self.handler_type, self.name);
Ok(s)
}
}
impl<R: Read + Seek> ReadBox<&mut R> for HdlrBox {
fn read_box(reader: &mut R, size: u64) -> Result<Self> {
let start = box_start(reader)?;
let (version, flags) = read_box_header_ext(reader)?;
reader.read_u32::<BigEndian>()?; let handler = reader.read_u32::<BigEndian>()?;
skip_bytes(reader, 12)?; let buf_size = size
.checked_sub(HEADER_SIZE + HEADER_EXT_SIZE + 20)
.ok_or(Error::InvalidData("hdlr size too small"))?;
let mut buf = vec![0u8; buf_size as usize];
reader.read_exact(&mut buf)?;
if let Some(end) = buf.iter().position(|&b| b == b'\0') {
buf.truncate(end);
}
let handler_string = String::from_utf8(buf).unwrap_or_default();
skip_bytes_to(reader, start + size)?;
Ok(HdlrBox {
version,
flags,
handler_type: From::from(handler),
name: handler_string,
})
}
}
impl<W: Write> WriteBox<&mut W> for HdlrBox {
fn write_box(&self, writer: &mut W) -> Result<u64> {
let size = self.box_size();
BoxHeader::new(self.box_type(), size).write(writer)?;
write_box_header_ext(writer, self.version, self.flags)?;
writer.write_u32::<BigEndian>(0)?; writer.write_u32::<BigEndian>((&self.handler_type).into())?;
for _ in 0..3 {
writer.write_u32::<BigEndian>(0)?;
}
writer.write_all(self.name.as_bytes())?;
writer.write_u8(0)?;
Ok(size)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::mp4box::BoxHeader;
use std::io::Cursor;
#[test]
fn test_hdlr() {
let src_box = HdlrBox {
version: 0,
flags: 0,
handler_type: str::parse::<FourCC>("vide").unwrap(),
name: String::from("VideoHandler"),
};
let mut buf = Vec::new();
src_box.write_box(&mut buf).unwrap();
assert_eq!(buf.len(), src_box.box_size() as usize);
let mut reader = Cursor::new(&buf);
let header = BoxHeader::read(&mut reader).unwrap();
assert_eq!(header.name, BoxType::HdlrBox);
assert_eq!(src_box.box_size(), header.size);
let dst_box = HdlrBox::read_box(&mut reader, header.size).unwrap();
assert_eq!(src_box, dst_box);
}
#[test]
fn test_hdlr_empty() {
let src_box = HdlrBox {
version: 0,
flags: 0,
handler_type: str::parse::<FourCC>("vide").unwrap(),
name: String::new(),
};
let mut buf = Vec::new();
src_box.write_box(&mut buf).unwrap();
assert_eq!(buf.len(), src_box.box_size() as usize);
let mut reader = Cursor::new(&buf);
let header = BoxHeader::read(&mut reader).unwrap();
assert_eq!(header.name, BoxType::HdlrBox);
assert_eq!(src_box.box_size(), header.size);
let dst_box = HdlrBox::read_box(&mut reader, header.size).unwrap();
assert_eq!(src_box, dst_box);
}
#[test]
fn test_hdlr_extra() {
let real_src_box = HdlrBox {
version: 0,
flags: 0,
handler_type: str::parse::<FourCC>("vide").unwrap(),
name: String::from("Good"),
};
let src_box = HdlrBox {
version: 0,
flags: 0,
handler_type: str::parse::<FourCC>("vide").unwrap(),
name: String::from_utf8(b"Good\0Bad".to_vec()).unwrap(),
};
let mut buf = Vec::new();
src_box.write_box(&mut buf).unwrap();
assert_eq!(buf.len(), src_box.box_size() as usize);
let mut reader = Cursor::new(&buf);
let header = BoxHeader::read(&mut reader).unwrap();
assert_eq!(header.name, BoxType::HdlrBox);
assert_eq!(src_box.box_size(), header.size);
let dst_box = HdlrBox::read_box(&mut reader, header.size).unwrap();
assert_eq!(real_src_box, dst_box);
}
}